使用Java创设RESTful Web Service

使用Java创建RESTful Web Service

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package com.eviac.blog.restws; import javax.ws.rs.GET;import javax.ws.rs.Path;import javax.ws.rs.PathParam;import javax.ws.rs.Produces;import javax.ws.rs.core.MediaType; /**** @author pavithra**/ // 这里@Path定义了类的层次路径。// 指定了资源类提供服务的URI路径。@Path("UserInfoService")public class UserInfo { // @GET表示方法会处理HTTP GET请求@GET// 这里@Path定义了类的层次路径。指定了资源类提供服务的URI路径。@Path("/name/{i}")// @Produces定义了资源类方法会生成的媒体类型。@Produces(MediaType.TEXT_XML)// @PathParam向@Path定义的表达式注入URI参数值。public String userName(@PathParam("i") String i) { String name = i;return "<User>" + "<Name>" + name + "</Name>" + "</User>";} @GET@Path("/age/{j}")@Produces(MediaType.TEXT_XML)public String userAge(@PathParam("j") int j) { int age = j;return "<User>" + "<Age>" + age + "</Age>" + "</User>";}}

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web.xml

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<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee <a href="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"</a> id="WebApp_ID" version="2.5"><display-name>RESTfulWS</display-name><servlet><servlet-name>Jersey REST Service</servlet-name><servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class><init-param><param-name>com.sun.jersey.config.property.packages</param-name><param-value>com.eviac.blog.restws</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>Jersey REST Service</servlet-name><url-pattern>/rest/*</url-pattern></servlet-mapping></web-app>

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输出结果如下：

创建客户端

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创建一个“com.eviac.blog.restclient”包，然后新建“UserInfoClient”类。

package com.eviac.blog.restclient; import javax.ws.rs.core.MediaType; import com.sun.jersey.api.client.Client;import com.sun.jersey.api.client.ClientResponse;import com.sun.jersey.api.client.WebResource;import com.sun.jersey.api.client.config.ClientConfig;import com.sun.jersey.api.client.config.DefaultClientConfig; /**** @author pavithra**/public class UserInfoClient { public static final String BASE_URI = "http://localhost:8080/RESTfulWS";public static final String PATH_NAME = "/UserInfoService/name/";public static final String PATH_AGE = "/UserInfoService/age/"; public static void main(String[] args) { String name = "Pavithra";int age = 25; ClientConfig config = new DefaultClientConfig();Client client = Client.create(config);WebResource resource = client.resource(BASE_URI); WebResource nameResource = resource.path("rest").path(PATH_NAME + name);System.out.println("Client Response \n"+ getClientResponse(nameResource));System.out.println("Response \n" + getResponse(nameResource) + "\n\n"); WebResource ageResource = resource.path("rest").path(PATH_AGE + age);System.out.println("Client Response \n"+ getClientResponse(ageResource));System.out.println("Response \n" + getResponse(ageResource));} /*** 返回客户端请求。* 例如：* GET http://localhost:8080/RESTfulWS/rest/UserInfoService/name/Pavithra* 返回请求结果状态“200 OK”。** @param service* @return*/private static String getClientResponse(WebResource resource) {return resource.accept(MediaType.TEXT_XML).get(ClientResponse.class).toString();} /*** 返回请求结果XML* 例如：<User><Name>Pavithra</Name></User>** @param service* @return*/private static String getResponse(WebResource resource) {return resource.accept(MediaType.TEXT_XML).get(String.class);}}

?运行客户端程序后，可以看到以下输出：

Client ResponseGET http://localhost:8080/RESTfulWS/rest/UserInfoService/name/Pavithra returned a response status of 200 OKResponse<User><Name>Pavithra</Name></User> Client ResponseGET http://localhost:8080/RESTfulWS/rest/UserInfoService/age/25 returned a response status of 200 OKResponse<User><Age>25</Age></User>

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